]>
git.ipfire.org Git - thirdparty/systemd.git/blob - namedev.c
6 * Copyright (C) 2003 Greg Kroah-Hartman <greg@kroah.com>
9 * This program is free software; you can redistribute it and/or modify it
10 * under the terms of the GNU General Public License as published by the
11 * Free Software Foundation version 2 of the License.
13 * This program is distributed in the hope that it will be useful, but
14 * WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * General Public License for more details.
18 * You should have received a copy of the GNU General Public License along
19 * with this program; if not, write to the Free Software Foundation, Inc.,
20 * 675 Mass Ave, Cambridge, MA 02139, USA.
34 #include <sys/sysinfo.h>
36 #include "libsysfs/sysfs/libsysfs.h"
40 #include "udev_version.h"
45 static struct sysfs_attribute
*find_sysfs_attribute(struct sysfs_class_device
*class_dev
, struct sysfs_device
*sysfs_device
, char *attr
);
47 LIST_HEAD(config_device_list
);
48 LIST_HEAD(perm_device_list
);
51 /* compare string with pattern (supports * ? [0-9] [!A-Z]) */
52 static int strcmp_pattern(const char *p
, const char *s
)
57 return (p
[0] != '\0');
68 while ((p
[0] != '\0') && (p
[0] != ']')) {
71 if ((s
[0] >= p
[0]) && (s
[0] <= p
[2]))
75 match
= (p
[0] == s
[0]);
79 while ((p
[0] != '\0') && (p
[0] != ']'))
82 return strcmp_pattern(p
+1, s
+1);
88 if (strcmp_pattern(p
, s
+1))
89 return strcmp_pattern(p
+1, s
);
97 if ((p
[0] == s
[0]) || (p
[0] == '?'))
98 return strcmp_pattern(p
+1, s
+1);
104 static struct perm_device
*find_perm(char *name
)
106 struct perm_device
*perm
;
108 list_for_each_entry(perm
, &perm_device_list
, node
) {
109 if (strcmp_pattern(perm
->name
, name
))
116 static mode_t
get_default_mode(void)
118 mode_t mode
= 0600; /* default to owner rw only */
120 if (strlen(default_mode_str
) != 0)
121 mode
= strtol(default_mode_str
, NULL
, 8);
126 static char *get_default_owner(void)
128 if (strlen(default_owner_str
) == 0)
129 strfieldcpy(default_owner_str
, "root");
131 return default_owner_str
;
134 static char *get_default_group(void)
136 if (strlen(default_group_str
) == 0)
137 strfieldcpy(default_group_str
, "root");
139 return default_group_str
;
142 /* extract possible {attr} and move str behind it */
143 static char *get_format_attribute(char **str
)
148 if (*str
[0] == '{') {
149 pos
= strchr(*str
, '}');
151 dbg("missing closing brace for format");
157 dbg("attribute='%s', str='%s'", attr
, *str
);
162 /* extract possible format length and move str behind it*/
163 static int get_format_len(char **str
)
168 if (isdigit(*str
[0])) {
169 num
= (int) strtoul(*str
, &tail
, 10);
172 dbg("format length=%i", num
);
175 dbg("format parsing error '%s'", *str
);
181 /** Finds the lowest positive N such that <name>N isn't present in
182 * $(udevroot) either as a file or a symlink.
184 * @param name Name to check for
185 * @return 0 if <name> didn't exist and N otherwise.
187 static unsigned int find_free_number (struct udevice
*udev
, char *name
)
189 char temp
[NAME_SIZE
];
190 char path
[NAME_SIZE
];
194 /* have to sweep the database for each lookup */
196 strncpy(temp
, name
, sizeof (temp
));
198 if (udevdb_get_dev_byname(temp
, path
, &dev
) != 0)
200 /* symlink might be stale if $(udevroot) isn't cleaned; check
201 * on major/minor to see if it's the same device
203 if (dev
.major
== udev
->major
&& dev
.minor
== udev
->minor
)
205 snprintf (temp
, sizeof(temp
), "%s%d", name
, ++result
);
212 static void apply_format(struct udevice
*udev
, char *string
, size_t maxsize
,
213 struct sysfs_class_device
*class_dev
,
214 struct sysfs_device
*sysfs_device
)
216 char temp
[NAME_SIZE
];
217 char temp2
[NAME_SIZE
];
227 struct sysfs_attribute
*tmpattr
;
228 unsigned int next_free_number
;
232 pos
= strchr(pos
, '%');
238 len
= get_format_len(&tail
);
240 strfieldcpy(temp
, tail
+1);
242 dbg("format=%c, string='%s', tail='%s'",c
, string
, tail
);
243 attr
= get_format_attribute(&tail
);
248 if (strlen(udev
->bus_id
) == 0)
250 strfieldcatmax(string
, udev
->bus_id
, maxsize
);
251 dbg("substitute bus_id '%s'", udev
->bus_id
);
254 if (strlen(udev
->kernel_name
) == 0)
256 strfieldcatmax(string
, udev
->kernel_name
, maxsize
);
257 dbg("substitute kernel name '%s'", udev
->kernel_name
);
260 if (strlen(udev
->kernel_number
) == 0)
262 strfieldcatmax(string
, udev
->kernel_number
, maxsize
);
263 dbg("substitute kernel number '%s'", udev
->kernel_number
);
266 strintcatmax(string
, udev
->minor
, maxsize
);
267 dbg("substitute minor number '%u'", udev
->minor
);
270 strintcatmax(string
, udev
->major
, maxsize
);
271 dbg("substitute major number '%u'", udev
->major
);
274 if (strlen(udev
->program_result
) == 0)
276 /* get part part of the result string */
279 i
= strtoul(attr
, &rest
, 10);
281 foreach_strpart(udev
->program_result
, " \n\r", spos
, slen
) {
287 dbg("requested part of result string not found");
291 strfieldcpy(temp2
, spos
);
293 strfieldcpymax(temp2
, spos
, slen
+1);
294 strfieldcatmax(string
, temp2
, maxsize
);
295 dbg("substitute part of result string '%s'", temp2
);
297 strfieldcatmax(string
, udev
->program_result
, maxsize
);
298 dbg("substitute result string '%s'", udev
->program_result
);
303 tmpattr
= find_sysfs_attribute(class_dev
, sysfs_device
, attr
);
304 if (tmpattr
== NULL
) {
305 dbg("sysfa attribute '%s' not found", attr
);
308 /* strip trailing whitespace of matching value */
309 if (isspace(tmpattr
->value
[strlen(tmpattr
->value
)-1])) {
310 i
= len
= strlen(tmpattr
->value
);
311 while (i
> 0 && isspace(tmpattr
->value
[i
-1]))
314 tmpattr
->value
[i
] = '\0';
315 dbg("remove %i trailing whitespace chars from '%s'",
316 len
- i
, tmpattr
->value
);
319 strfieldcatmax(string
, tmpattr
->value
, maxsize
);
320 dbg("substitute sysfs value '%s'", tmpattr
->value
);
322 dbg("missing attribute");
326 strfieldcatmax(string
, "%", maxsize
);
330 next_free_number
= find_free_number(udev
, string
);
331 if (next_free_number
> 0) {
332 snprintf(temp2
, sizeof(temp2
), "%d", next_free_number
);
333 strfieldcatmax(string
, temp2
, maxsize
);
337 dbg("unknown substitution type '%%%c'", c
);
340 /* truncate to specified length */
344 strfieldcatmax(string
, tail
, maxsize
);
348 static void fix_kernel_name(struct udevice
*udev
)
350 char *temp
= udev
->kernel_name
;
352 while (*temp
!= 0x00) {
353 /* Some block devices have a ! in their name,
354 * we need to change that to / */
361 static int execute_program(const char *path
, char *value
, int len
)
369 char arg
[PROGRAM_SIZE
];
370 char *argv
[(PROGRAM_SIZE
/ 2) + 1];
373 strfieldcpy(arg
, path
);
375 if (strchr(path
, ' ')) {
377 while (pos
!= NULL
) {
378 if (pos
[0] == '\'') {
379 /* don't separate if in apostrophes */
381 argv
[i
] = strsep(&pos
, "\'");
382 while (pos
&& pos
[0] == ' ')
385 argv
[i
] = strsep(&pos
, " ");
387 dbg("arg[%i] '%s'", i
, argv
[i
]);
391 dbg("execute '%s' with parsed arguments", arg
);
394 argv
[1] = main_argv
[1];
396 dbg("execute '%s' with subsystem '%s' argument", arg
, argv
[1]);
409 /* dup2 write side of pipe to STDOUT */
410 dup2(fds
[1], STDOUT_FILENO
);
411 retval
= execv(arg
, argv
);
413 info(FIELD_PROGRAM
" execution of '%s' failed", path
);
419 /* parent reads from fds[0] */
424 count
= read(fds
[0], value
+ i
, len
- i
-1);
430 dbg("result len %d too short", len
);
437 dbg("read failed with '%s'", strerror(errno
));
441 if (i
> 0 && value
[i
-1] == '\n')
444 dbg("result is '%s'", value
);
449 if (!WIFEXITED(status
) || (WEXITSTATUS(status
) != 0)) {
450 dbg("exec program status 0x%x", status
);
457 static struct sysfs_attribute
*find_sysfs_attribute(struct sysfs_class_device
*class_dev
, struct sysfs_device
*sysfs_device
, char *attr
)
459 struct sysfs_attribute
*tmpattr
= NULL
;
462 dbg("look for device attribute '%s'", attr
);
463 /* try to find the attribute in the class device directory */
464 tmpattr
= sysfs_get_classdev_attr(class_dev
, attr
);
468 /* look in the class device directory if present */
470 tmpattr
= sysfs_get_device_attr(sysfs_device
, attr
);
478 c
= strchr(tmpattr
->value
, '\n');
482 dbg("found attribute '%s'", tmpattr
->path
);
486 static int compare_sysfs_attribute(struct sysfs_class_device
*class_dev
, struct sysfs_device
*sysfs_device
, struct sysfs_pair
*pair
)
488 struct sysfs_attribute
*tmpattr
;
492 if ((pair
== NULL
) || (pair
->file
[0] == '\0') || (pair
->value
== '\0'))
495 tmpattr
= find_sysfs_attribute(class_dev
, sysfs_device
, pair
->file
);
499 /* strip trailing whitespace of value, if not asked to match for it */
500 if (! isspace(pair
->value
[strlen(pair
->value
)-1])) {
501 i
= len
= strlen(tmpattr
->value
);
502 while (i
> 0 && isspace(tmpattr
->value
[i
-1]))
505 tmpattr
->value
[i
] = '\0';
506 dbg("remove %i trailing whitespace chars from '%s'",
507 len
- i
, tmpattr
->value
);
511 dbg("compare attribute '%s' value '%s' with '%s'",
512 pair
->file
, tmpattr
->value
, pair
->value
);
513 if (strcmp_pattern(pair
->value
, tmpattr
->value
) != 0)
516 dbg("found matching attribute '%s' with value '%s'",
517 pair
->file
, pair
->value
);
521 static int match_sysfs_pairs(struct config_device
*dev
, struct sysfs_class_device
*class_dev
, struct sysfs_device
*sysfs_device
)
523 struct sysfs_pair
*pair
;
526 for (i
= 0; i
< MAX_SYSFS_PAIRS
; ++i
) {
527 pair
= &dev
->sysfs_pair
[i
];
528 if ((pair
->file
[0] == '\0') || (pair
->value
[0] == '\0'))
530 if (compare_sysfs_attribute(class_dev
, sysfs_device
, pair
) != 0) {
531 dbg("sysfs attribute doesn't match");
539 static int match_id(struct config_device
*dev
, struct sysfs_class_device
*class_dev
, struct sysfs_device
*sysfs_device
)
541 char path
[SYSFS_PATH_MAX
];
544 /* we have to have a sysfs device for ID to work */
548 strfieldcpy(path
, sysfs_device
->path
);
549 temp
= strrchr(path
, '/');
551 dbg("search '%s' in '%s', path='%s'", dev
->id
, temp
, path
);
552 if (strcmp_pattern(dev
->id
, temp
) != 0)
558 static int match_place(struct config_device
*dev
, struct sysfs_class_device
*class_dev
, struct sysfs_device
*sysfs_device
)
560 char path
[SYSFS_PATH_MAX
];
564 /* we have to have a sysfs device for PLACE to work */
569 strfieldcpy(path
, sysfs_device
->path
);
570 temp
= strrchr(path
, '/');
571 dbg("search '%s' in '%s', path='%s'", dev
->place
, temp
, path
);
572 if (strstr(temp
, dev
->place
) != NULL
) {
576 temp
= strrchr(path
, '/');
577 dbg("search '%s' in '%s', path='%s'", dev
->place
, temp
, path
);
578 if (strstr(temp
, dev
->place
) != NULL
)
582 dbg("place doesn't match");
589 static int match_rule(struct config_device
*dev
, struct sysfs_class_device
*class_dev
, struct udevice
*udev
, struct sysfs_device
*sysfs_device
)
592 /* check for matching bus value */
593 if (dev
->bus
[0] != '\0') {
594 if (sysfs_device
== NULL
) {
595 dbg("device has no bus");
598 dbg("check for " FIELD_BUS
" dev->bus='%s' sysfs_device->bus='%s'", dev
->bus
, sysfs_device
->bus
);
599 if (strcmp_pattern(dev
->bus
, sysfs_device
->bus
) != 0) {
600 dbg(FIELD_BUS
" is not matching");
603 dbg(FIELD_BUS
" matches");
607 /* check for matching kernel name*/
608 if (dev
->kernel
[0] != '\0') {
609 dbg("check for " FIELD_KERNEL
" dev->kernel='%s' class_dev->name='%s'", dev
->kernel
, class_dev
->name
);
610 if (strcmp_pattern(dev
->kernel
, class_dev
->name
) != 0) {
611 dbg(FIELD_KERNEL
" is not matching");
614 dbg(FIELD_KERNEL
" matches");
618 /* check for matching bus id */
619 if (dev
->id
[0] != '\0') {
620 dbg("check " FIELD_ID
);
621 if (match_id(dev
, class_dev
, sysfs_device
) != 0) {
622 dbg(FIELD_ID
" is not matching");
625 dbg(FIELD_ID
" matches");
629 /* check for matching place of device */
630 if (dev
->place
[0] != '\0') {
631 dbg("check " FIELD_PLACE
);
632 if (match_place(dev
, class_dev
, sysfs_device
) != 0) {
633 dbg(FIELD_PLACE
" is not matching");
636 dbg(FIELD_PLACE
" matches");
640 /* check for matching sysfs pairs */
641 if (dev
->sysfs_pair
[0].file
[0] != '\0') {
642 dbg("check " FIELD_SYSFS
" pairs");
643 if (match_sysfs_pairs(dev
, class_dev
, sysfs_device
) != 0) {
644 dbg(FIELD_SYSFS
" is not matching");
647 dbg(FIELD_SYSFS
" matches");
651 /* execute external program */
652 if (dev
->program
[0] != '\0') {
653 char program
[PROGRAM_SIZE
];
655 dbg("check " FIELD_PROGRAM
);
656 strfieldcpy(program
, dev
->program
);
657 apply_format(udev
, program
, sizeof(program
), class_dev
, sysfs_device
);
658 if (execute_program(program
, udev
->program_result
, NAME_SIZE
) != 0) {
659 dbg(FIELD_PROGRAM
" returned nonzero");
662 dbg(FIELD_PROGRAM
" returned successful");
666 /* check for matching result of external program */
667 if (dev
->result
[0] != '\0') {
668 dbg("check for " FIELD_RESULT
669 " dev->result='%s', udev->program_result='%s'",
670 dev
->result
, udev
->program_result
);
671 if (strcmp_pattern(dev
->result
, udev
->program_result
) != 0) {
672 dbg(FIELD_RESULT
" is not matching");
675 dbg(FIELD_RESULT
" matches");
679 /* Yeah, we matched! */
683 dbg("try parent sysfs device");
684 sysfs_device
= sysfs_get_device_parent(sysfs_device
);
685 if (sysfs_device
== NULL
)
687 dbg("sysfs_device->path='%s'", sysfs_device
->path
);
688 dbg("sysfs_device->bus_id='%s'", sysfs_device
->bus_id
);
689 dbg("sysfs_device->bus='%s'", sysfs_device
->bus
);
694 int namedev_name_device(struct udevice
*udev
, struct sysfs_class_device
*class_dev
)
696 struct sysfs_class_device
*class_dev_parent
;
697 struct sysfs_device
*sysfs_device
= NULL
;
698 struct config_device
*dev
;
699 struct perm_device
*perm
;
704 dbg("class_dev->name='%s'", class_dev
->name
);
706 /* Figure out where the "device"-symlink is at. For char devices this will
707 * always be in the class_dev->path. On block devices, only the main block
708 * device will have the device symlink in it's path. All partition devices
709 * need to look at the symlink in its parent directory.
711 class_dev_parent
= sysfs_get_classdev_parent(class_dev
);
712 if (class_dev_parent
!= NULL
) {
713 dbg("given class device has a parent, use this instead");
714 sysfs_device
= sysfs_get_classdev_device(class_dev_parent
);
716 sysfs_device
= sysfs_get_classdev_device(class_dev
);
720 dbg("found devices device: path='%s', bus_id='%s', bus='%s'",
721 sysfs_device
->path
, sysfs_device
->bus_id
, sysfs_device
->bus
);
722 strfieldcpy(udev
->bus_id
, sysfs_device
->bus_id
);
723 strfieldcpy(udev
->bus
, sysfs_device
->bus
);
726 strfieldcpy(udev
->kernel_name
, class_dev
->name
);
727 fix_kernel_name(udev
);
728 dbg("udev->kernel_name = '%s'", udev
->kernel_name
);
730 /* get kernel number */
731 pos
= class_dev
->name
+ strlen(class_dev
->name
);
732 while (isdigit(*(pos
-1)))
734 strfieldcpy(udev
->kernel_number
, pos
);
735 dbg("kernel_number='%s'", udev
->kernel_number
);
737 /* look for a matching rule to apply */
738 list_for_each_entry(dev
, &config_device_list
, node
) {
740 if (match_rule(dev
, class_dev
, udev
, sysfs_device
) == 0) {
741 if (dev
->name
[0] == '\0' && dev
->symlink
[0] == '\0') {
742 info("configured rule in '%s' at line %i applied, '%s' is ignored",
743 dev
->config_file
, dev
->config_line
, udev
->kernel_name
);
747 if (dev
->symlink
[0] != '\0') {
748 char temp
[NAME_SIZE
];
750 info("configured rule in '%s' at line %i applied, added symlink '%s'",
751 dev
->config_file
, dev
->config_line
, dev
->symlink
);
752 strfieldcpy(temp
, dev
->symlink
);
753 apply_format(udev
, temp
, sizeof(temp
), class_dev
, sysfs_device
);
754 if (udev
->symlink
[0] != '\0')
755 strfieldcat(udev
->symlink
, " ");
756 strfieldcat(udev
->symlink
, temp
);
759 if (dev
->name
[0] != '\0') {
760 /* apply all_partitions flag only at a main block device */
761 if (dev
->partitions
> 0 &&
762 (udev
->type
!= 'b' || udev
->kernel_number
[0] != '\0'))
765 info("configured rule in '%s' at line %i applied, '%s' becomes '%s'",
766 dev
->config_file
, dev
->config_line
, udev
->kernel_name
, dev
->name
);
767 strfieldcpy(udev
->name
, dev
->name
);
772 /* no rule was found so we use the kernel name */
773 strfieldcpy(udev
->name
, udev
->kernel_name
);
774 if (udev
->type
== 'n')
780 apply_format(udev
, udev
->name
, sizeof(udev
->name
), class_dev
, sysfs_device
);
781 strfieldcpy(udev
->config_file
, dev
->config_file
);
782 udev
->config_line
= dev
->config_line
;
784 if (udev
->type
== 'n')
787 udev
->partitions
= dev
->partitions
;
789 /* get permissions given in rule */
790 set_empty_perms(udev
, dev
->mode
,
795 /* get permissions given in config file or set defaults */
796 perm
= find_perm(udev
->name
);
798 set_empty_perms(udev
, perm
->mode
,
802 set_empty_perms(udev
, get_default_mode(),
804 get_default_group());
806 dbg("name, '%s' is going to have owner='%s', group='%s', mode = %#o",
807 udev
->name
, udev
->owner
, udev
->group
, udev
->mode
);
810 /* store time of action */
812 udev
->config_uptime
= info
.uptime
;
817 int namedev_init(void)
821 retval
= namedev_init_rules();
825 retval
= namedev_init_permissions();
829 dump_config_dev_list();
830 dump_perm_dev_list();